The following condition is provided by catworkx Extended Group Management:
[cwx] Jira Group Matches Multi Userpicker Condition
Checks if the users in a Jira group match to the users selected in a multi users picker field.
- Groupselector: Select the single group picker custom field that contains the Jira group you want to check.
- Groupmembers: Select the multi user picker custom field you want to check if they are also in the "Groupselector" group.